[time-nuts] Datum OT-20 "Office Time"

[Arthur Dent]

Here is a little more info on the OT-20.

I connected my OT-20 to a cell antenna and a 
48VDC power supply and let the unit warm up. 
I used a terminal emulator set to 9600 8N1 to 
talk to the unit. The link below is the response 
of the OT-20 to various commands I sent to it. 
Press "shift ?" on your terminal emulator to 
have the unit send you the list of accepted 
commands.

After warming up and locking to the CDMA signal, 
most of the alarm LEDs went out. The one that 
stayed on indicated that there was only one 
48VDC supply connected and that is considered 
a minor alarm condition. Jumpering the 2 inputs 
will eliminate this alarm. The output BNC on my 
unit puts out a 10Mhz sine wave. There is also a 
DS1620D1 chip in the OT-20 to report the temper-
ature and probably aid in keeping the output closer 
to the 10Mhz during periods of holdover

http://farm6.static.flickr.com/5134/5448082945_13798a2669_b.jpg

-Arthur